Dicyclomine

# Dicyclomine ## Overview - **Classification**: Anticholinergic, Antispasmodic - **Mechanism**: Blocks acetylcholine at muscarinic receptors on smooth muscle, reducing gastrointestinal spasms and motility. ## Primary Indications 1. **Irritable Bowel Syndrome (IBS)** - Treatment of functional bowel disorders characterized by smooth muscle spasm. ## Adult Dosing ### Standard Dosing **Irritable Bowel Syndrome (IBS)** - **Dose**: Initially **20 mg** - **Frequency**: Four times daily (QID) - **Route**: Oral (PO) - **Special Consideration**: May increase to **40 mg** QID if initial dose is tolerated but insufficient after 1 week. - **Maximum Dose**: **160 mg/day** ### Dose Adjustments - **Renal Impairment**: Use with caution. Consider lower doses due to increased risk of anticholinergic effects. - **Hepatic Impairment**: Use with caution. Consider lower doses due to increased risk of anticholinergic effects. - **Elderly Patients**: Start with lower doses (**10 mg** QID) due to increased sensitivity to anticholinergic side effects (e.g., confusion, urinary retention). ## Pediatric Dosing ### Neonates (0-28 days) - **Dose**: **CONTRAINDICATED** - **Special Notes**: Risk of serious adverse effects including respiratory distress, seizures, and death. ### Infants (1-12 months) - **Dose**: **CONTRAINDICATED** for infants **< 6 months**. - **Special Notes**: Not generally recommended for infants 6-12 months due to limited safety data and risk of adverse events. ### Children (1-12 years) - **Dose**: Not generally recommended; use is off-label and requires careful risk/benefit assessment. - **If used (off-label)**: **10 mg** - **Frequency**: Three to four times daily (TID-QID) - **Maximum**: **40 mg/day** - **Special Notes**: Monitor closely for anticholinergic side effects. ### Adolescents (13-18 years) - **Dose**: Adult dosing typically applies. - **Maximum**: **160 mg/day** ## Safety Information ### Contraindications - **Absolute**: Obstructive uropathy, obstructive GI disease, severe ulcerative colitis, reflux esophagitis. - **Absolute**: Glaucoma, myasthenia gravis, **infants < 6 months**, breastfeeding. ### Common Adverse Effects - **Very Common (>10%)**: Dry mouth, blurred vision. - **Common (1-10%)**: Dizziness, somnolence, nausea, nervousness, constipation. - **Serious but Rare**: Tachycardia, acute glaucoma, psychosis/confusion (especially in elderly). ### Key Drug Interactions - **Other Anticholinergics**: Increased anticholinergic effects (e.g., TCAs, antihistamines). Avoid concurrent use or monitor closely. - **Antacids**: May decrease dicyclomine absorption. Separate administration by at least 2 hours. - **Opioids**: Increased risk of severe constipation and paralytic ileus. Monitor bowel function. - **Digoxin**: Dicyclomine may increase digoxin absorption. Monitor digoxin levels. ## Monitoring & Follow-up - **Before Treatment**: Assess for contraindications (e.g., glaucoma, obstructive conditions). - **During Treatment**: Monitor for symptom relief and anticholinergic side effects (dry mouth, blurred vision, urinary retention, constipation, confusion). - **Clinical Signs**: Watch for worsening GI symptoms, eye pain, or signs of urinary retention. ## Clinical Pearls - 💡 **Timing**: Take **30-60 minutes before meals** for optimal efficacy if spasms are post-prandial. - 💡 **Sedation**: May cause **dizziness or drowsiness**. Advise patients to avoid driving or operating machinery until effects are known. - 💡 **Acute Relief**: Not intended for immediate relief of acute pain episodes or severe, sudden abdominal pain. - 💡 **Hydration**: Advise patients to drink plenty of fluids to mitigate dry mouth and constipation. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.